Looks brilliant. It can of course always be better, but most sims don't even have rain visuals making this unique.
And this is a screenshot, static shots usually don't look as good as moving footage. Especially in computer graphics.

These are my suggestions:
If the droplet coordinates (with the wind shield as a grid) could be generated through FFT or Perlin noise, it would look more natural.

This can be used for rain splatter on the track aswell.

Also, drops should cast shadows and refract light if possible. This can be done through vertex shaders. Perhaps not a priority but it would make a nice addition.